To restore the mouse acceleration behavior we used to have on Fedora 21 and older, you simply need to launch this instruction as root:cat < /etc/X11/xorg.conf.d/50-mouse-acceleration.confSection "InputClass"Identifier "My Mouse"MatchIsPointer "yes"Option "AccelerationProfile" "-1"Option "AccelerationScheme" "none"Option "AccelSpeed" "-1"EndSectionEOF